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Best way to insulate attic with full plywood flooring? (lemmy.sdf.org)

submitted 1 week ago by [email protected] to c/[email protected]

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My house entire attic has plywood flooring over the joists/insulation.

It is nailed in and a pain in the ass to remove.

What is the best way to add additional insulation to the attic? I worry the plywood/insulation underneath has a bad r value.

Do I need to take up all the plywood and re insulate the batts? Should I just loose fill on top of the plywood?

Ideally I want to air seal it to but taking the plywood up will be a nightmare.

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[–] [email protected] 2 points 1 week ago (1 children)

Why would you want to heat non-living space? That is a waste of energy. The attic is outside of the house as far as your furnace is concerned.

[–] [email protected] -1 points 1 week ago* (last edited 1 week ago)

I'm not saying rip the existing insulation out and do the roof/ceiling

I'm saying leave that, and add the insulation to the roof/ceiling.

If it has plywood floors, it's usable for storage, and these days theyre often eventually remodeled to become a bedroom drastically increasing value of the home.

So rather than remove the poor performing insulation in the attic floor, leave it and add more to help the attic become a living space eventually.

It's just planning for the future, and achieves the same result.

Even if it's sealed (it shouldn't be), the giant air pocket of slightly warmer air would be working as insulation as well.

So from outside to lower level, there'd be more r factor and it would be more energy efficient

Like, they're not "heating" it unless there's vents up there anyways...

You made a short comment, but there's a lot wrong with it.